Airplane Multi-Pack - 8 Pack of HS-485HB Deluxe Ball Bearing Karbonite Gear Standard Servos from Hitec - HRC33485S
Hitec’s HS-45HB offers the economy and durability of their other famous micro servos, but now with a ball bearing supported output shaft and Karbonite gears.
Features:

Convenient servo eight pack is perfect for balsa ARF models
Ideal for .20 - .60 class aircraft and all EP and GP .30-.50 class helicopters
Karbonite gear train that is four times stronger than standard plastic gears
Three pole motor and single ball bearing output shaft

Includes:

8 Hitec HHS-485HB Deluxe ball bearing Karbonite gear standard servos with universal connectors
8x 0.94" (24mm) diameter round horn
8x 1.2" (31mm) diameter 4-point horn
8x 1.3" (34mm) double-arm horn
8x 1.2" (30.5mm) single-arm horn
32 each rubber grommets, eyelets, and mounting screws